Filtering device



y 1940- G. R. MCCORMICK ET AL 2,208,135

FILTERING DEVICE Filed Nov. 16, 1938 3 Sheets-Sheet l GORDON QRMICK|NVENTOR$ Roma GJQU E BY MC 7% ATTORNEY y 1940- G. R. MccoRmck ET A1.

FILTERING DEVICE Filed Nov. 16, 1958 3 Sheets-Sheet 2 GORDON RM fINVENTORS 7 Raw G. Passe.

BY W C 7% ATTORNEY July 16, 1940. e. R. McCORMICK ET AL I 2,203,135

FILTERING DEVIC E Filed Nov. 16, 195 s SheetsSheet 5 Gama/y R. M C0RM/c/ROLLO 6/?1/55541.

(D A'ITTQRNEY INVENTORS I Patented July 16,1940 v r 2,208,135

UNITED STATES PATENT OFFICE" FETEFIIZZ I D EVIGE I Gordon R. McCormickand Rollo G. Russell, Flint, Mich assignors to E. I. du Pont de Nemours& Company, Wilmington, Del., a corporation of Delaware ApplicationNovember 16, 1938, Serial No. 240,649

2 Claims. (Cl. 210-481 g This invention relates to an apparatus forrethe unit. It will be apparent from the following moving sand, dirt,hair, and other foreign madescription that a relatively'small housingwill terial from liquids and relates more particularly accommodate anextremely large area of screen to a device for screening foreign matterfrom for filtering the liquids. 5 liquids which may be passed throughthe device In the drawings, Figure 1 is a diagrammatic I at a high rateof speed. y a side elevation showing the housing, a portion of In thepreparation of paints, enamels, lacquers, the filtering unit, a gasketand an end plate. finger nail polishes, liquid cements, furniture Figure2 is a detailed partial section along the polishes, thinners, and thelike, it. often happens line 2-2 of Figure 3. Figure 3 is a plan view tothat a small amount of sand, grit, splinters of of one section of thescreen assembly. Figure 4 l0 wood, coarse particles of pigment, andother obis a plan view of the entire unit in which four jectionablematerial finds its way into the manusections are used. Figure 5 is asection through factured product. This must be removed since Figure 1;Figure 5-A. is an enlarged section of it would have a deleterious effecton the use to the lower left-hand corner of Figure 5 showing it whichthe liquid is put subsequently; for exthe arrangement of the parts;Figure 6 is a plan ample, a small amount of sand in a furniture view ofthe end plate ll. In all figures the same polish would produce scratchesand probably characters refer to the same parts. leave the finish in apoorer condition than be- In Figure 1 the housing is indicated as l andfore the polish was applied. Likewise in the is provided with an inlet 2and an outlet 3. The

spraying of paints, enamels, and lacquers, a few housing is .alsoprovided with a flange l and a go particles of pigment agglomerateswould give the gasket 5.'-, I'his gasket has the same general finish avery undesirable appearance and may shape as the flange 4. A cover I! isalso provided necessitate the refinishing of the object to which whichis held in place by means of clamps (not the coating composition hadbeen applied. shown) or other means such as those commonly w Therefore,the present invention is particularly used on autoclaves. The unit whichactually ,5 suitable for screening coarse particles from such does thefiltering may be made up in any numqilldsher of sections. In Figure 1,four are shown.

Many devices are on the market which accom- The sections are made up ofa rectangular frame 1 1 a purpo e Sim lar t tha for whi h the the edgesof which are made into the form of a w herein disclosed apparatus hasbeen designed. right isosceles triangle instead oi a flat side..goHowever, they are usually very cumbersome and The end opposite thatwhich contacts plate i1 is are not easily moved from one position toanlikewise of this form. other. In Figure 2 the frame of angle iron isshown as It is, therefore, an object of this invention to It; over thisframe is spread the wire screen I3. provide an apparatus for filteringrelatively This is usually bought in standardwidths, and 3 .coarseparticles from liquids very rapidly. It is the frame is made of such asize that it will also an object of the present invention to proacceptthis width without'waste. Over the four vide an apparatus which not onlyaccomplishes edges of the wire fabric ii are metal strips II thispurpose but is' simple,light inweight, and and angle iron It which clampthe wire fabric m onet which. may be produced at a relatively lowsecurely in place. The angle iron I6 is held in 49 cos i Afurther'object of this invention is the probe held in place'against theplate l 'l by means vision of a device which occupies a minimum or longbolts having a cross member I and a of space and may be carried from"one location wing nut 8 as shown in Figure 4. The plate to anotherwithout the use of a truck. A still I! may be recessed or provided witha pin to 5 further object is the provision of a device in hold the framein place. After the filter unit which screens of standard width may beused has been'provided with screens, it is ready for and can be cut froma roll without waste. insertion in the housing. In order to avoid Theseobjects are accomplished by the present leakage around the outlet, theend plate I1 is 50 apparatus in which a lioustng provided with anprovided with a gasket II. The unit is then ingo inlet and an outlet forthe liquids to be filtered serted in'the housing and held in place bymeans has a unit made up of a plurality of frames on of a spring 9 and across member In. The cover each side of which are clamped suitablescreens l2 and gasket 5 are put in place and secured by so that as theliquid passes through the housing, a means of clamps. In Figure 5, i9 isan aligning it must also pass through one of the screens in pin which issecured to plate l1 and registers in u holes 20 in the plate I].

In the operation of the apparatus the liquid enters through the inlet 2which may be under any reasonable amount of pressure. It then flowsaround the filter screens and fills the entire housing. Anyair which maybe entrapped can be liberated by means of a pet-cock in the'upper sideof the housing (not shown), The liquid passes through the screen on thesidesof the filter sections and out through the outlet shown oppositethe end provided with the cover. The liquid passes out of the unitthrough the outlet 3 and may he collected in any convenient manner ormay he passed through another filter of similar design having filtercloth or other finer filtering medium instead of the screen 13. It is tohe understood that the inlet may also be located in the bottom or top aswell as on any of the sides. i

The advantages of the present invention are that the apparatus occupiesa minimum of space and may be taken down and set up in a very fewminutes. Another advantage is that the filtering surface is extremelylargewith relation to the space occupied by the entire apparatus. Astill further advantage is that the device uses wire cloth vof astandard size without anywaste and does not depend .on soldering forsecuringthe wire cloth in place. A that the entire apparatus isrelatively light and may be carried by one man, whereas most filter-:ing devices of the prior art having the same fil- .tering surface wouldrequire a truck to move it about.

It is apparent that many widely diflerent emments of this invention'maybe made without departing from the spirit and scope thereof,

still further advantage is and therefore, it is not intended to belimited except as indicated in-the appended claims.

We claim:

1. An apparatus for filtering liquids which comprises a closed fluidtight housing provided with an inlet and an outlet and a filteringdevice within the said housing comprising a frame having rectangularsides, the distance between the said sides 'being small with respect tothe length of the edges of the frame, each side of the said frame havinga screen extending over it and removable clamps on three edges of theperiphery of the frame for clamping the said screen to the said frame,and means for fastening the remaining edge against a plate having a holewithin the areadeflned by the ends of the screen and the clamps, andmeans for holding the said plate against the outlet of the liquid maypass through the screen, through the hole in the plate, and thereafterthrough the ."said outlet.

2. A filtering device comprising a filter unit and a fluid tight housingabout the said unit, the housing comprising an inlet and an outlet and agasket around the outlet, said unit comprising a plate provided with aplurality of elongated holes and a plurality of frames adapted to make afluid tigh-t fit around each of the said holes, the frames beingprovided with clamping means about-their edges, and a screen on eachside of the said frames extending over the edges thereof and under thesaid clamping means, and means for tightening the same to the frameswhereby the liquid to be filtered cannot pass unfiltered between-thescreen and the frame, and means ior holding the said filtering unittightly against the said gasket whereby the liquid to be filtered mustenter the housing, pass through the screens and out the said holes andthrough the outlet of the said housing.

GGRDON R. McCORMICK. ROLL-O G. RUSSELL.

filter housing whereby

